When I was taking impeller housing cover off this year, one of the brass screw heads sheared off. On my DD I can't remove the ski pylon, so I am trying to remove the entire housing to re-drill and re-tap it for a new screw. Problem is, it seems like the bearing has completely corroded itself onto the housing. Any tips/advice for getting it off? It's in a tough spot, no real angle to get leverage and pry.